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Old 12-08-2011, 05:52 AM
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Default how is a vehicles resonant frequency determined?

sorry if this is a stupid question but i see people referring to this and im curious how knowing this benefits a person? will it be loudest at that point?

Thanks,
Justin
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Old 12-08-2011, 06:11 AM
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Wish i knew the answer to this as well but I went about it the long way to find mine.

Buy a meter and test, test, and test some more!

I thought I peaked at 40hz from my first comp and do still if my window is cracked but I also know now that I peak at 39 sealed up so I'm not sure if there is a mathematical way of finding this out without testing on a meter...could be wrong though!
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Old 12-08-2011, 06:21 AM
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so the idea is that if that tone is played at said frequency it should be the loudest in that particular vehicle?

also i would imagine that this would still be different even on same make model cars then also? every one is different?
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Old 12-08-2011, 06:27 AM
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There is a mathematical way I don't remember it but it has to do with the 1/4 wave of the longest distance from subs to mic location. It can get you close but every car is different

Or by using a meter you want to build a box with. A very even frequency response, meter it outside the car(big open space) then put it in the car and find the difference.
The peak won't always be the best frequency though sometimes a different frequency will gain better when more power is applied and will eventually pass up your vehicles resonant frequency.
This is we're you test test and test some more
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Old 12-08-2011, 06:32 AM
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The idea is to have the vehicle resonance match tuning in order to maximize sound pressure. Its mainly used for burps since only 1 note is played.
To find it you need to build a sealed box to exact specs and test outside the vehicle. That gives you the base line. Then do the same with the box in the vehicle. When you graph the two results you will see a spike on the in car test. That is usually the vehicle resonance.
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I think it's probably because that sub is not moving enough to allow it to cool.. Id turn the gain up a bit so it moves more for cooling reasons.. That's why it's hard on subs to be underpowered..
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Old 12-08-2011, 06:35 AM
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Quote:
Originally Posted by tymoto21 View Post
There is a mathematical way I don't remember it but it has to do with the 1/4 wave of the longest distance from subs to mic location. It can get you close but every car is different

Or by using a meter you want to build a box with. A very even frequency response, meter it outside the car(big open space) then put it in the car and find the difference.
The peak won't always be the best frequency though sometimes a different frequency will gain better when more power is applied and will eventually pass up your vehicles resonant frequency.
This is we're you test test and test some more
Quater wave theory is different from vehicle resonance.
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I think it's probably because that sub is not moving enough to allow it to cool.. Id turn the gain up a bit so it moves more for cooling reasons.. That's why it's hard on subs to be underpowered..
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Old 12-08-2011, 06:39 AM
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Yes mark thats the best way but its only accurate if you displace as much air during testikg as the box that will go in. You can't test with A 1cf box and then throw in a 6cf box the Res freq will change with the cabin size change.
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Old 12-08-2011, 06:42 AM
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Like someone mentioned, my loudest freq that I burp at isn't my vehicle's resonant freq.


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Old 12-08-2011, 10:26 AM
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Quote:
Originally Posted by audioarsonal View Post
The idea is to have the vehicle resonance match tuning in order to maximize sound pressure. Its mainly used for burps since only 1 note is played.
To find it you need to build a sealed box to exact specs and test outside the vehicle. That gives you the base line. Then do the same with the box in the vehicle. When you graph the two results you will see a spike on the in car test. That is usually the vehicle resonance.
^^This.

You don't need an expensive meter for this either since you will not be measuring at full volume. You could probably even use one of the iphone/android apps that measure sound levels. What is meant by exact specs is try to build this sealed box to be as flat of response as possible. Measure the output from a specific distance in an open room at a set volume level. Jump up in 1hz increments without changing volume. Carefully record your results on graphing paper. Repeat this process with the sub in the car in the approximate location the real sub will be in the car. I actually like to test with the sub in several different places to get as much data as possible. Also, if you plan to take up cabin space-with an enclosure or wall etc-plan for that as well as your freq will change when cabin volume decreases. Also note that this freq will probably change +/- a hz or several when burping at full volume.

1/4 wave theory is different, but can be helpful in this process as well.
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Old 12-08-2011, 10:27 AM
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Quote:
Originally Posted by chapdawg1971 View Post
Like someone mentioned, my loudest freq that I burp at isn't my vehicle's resonant freq.


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Ever try to tune for that freq? Could be some gain to be seen there.
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